Change the subject of Woocommerce admin email notification for a specific category

Question

I am trying to either disable or change the subject line on the woocommerce confirmation email that goes to admins.

I want to do this for only one specific product category.

Any help is appreciated.

Answer 1

Update (related to your comment).

Using a custom function hooked in woocommerce_email_subject_new_order filter hook will allow you to change the subject for "New Order" admin email notification, for a specific product category.

You will have to define in the code below the targeted product category and the custom subject:

add_filter( 'woocommerce_email_subject_new_order', 'custom_subject_for_new_order', 10, 2 );
function custom_subject_for_new_order( $subject, $order ) {
    $found = $others = false;

    // HERE define your product categories in the array (can be IDs Slugs or Names)
    $categories = array('clothing'); // coma separated for multiples categories

    // HERE define your custom subject for those defined product categories
    $custom_subject  = __("My custom subject goes here", "woocommerce");

    // Loop through order items
    foreach( $order->get_items() as $item ){
        if( has_term( $categories, 'product_cat', $item->get_product_id() ) && $found )
            $found = true; // Category is found
        else
            $others = true; // Other Categories are found
    }
    // Return the custom subject when targeted product category is found but not others.
    return $found && ! $others ? $custom_subject : $subject;
}

Code goes in function.php file of the active child theme (or active theme).

Tested and works.